RA107-05 did go on loan to SA, but it never raced under their banner. It is however the late RA107B spec chassis, which is somewhat different to the chassis used at the launch.
I havent come across any SA parts on the car(these have a prefix 'P' in the parts #), they all have the standard Honda parts numbers laser etched. There's no 2008 parts on the car, but a few 2006 parts were carried over. Even older parts was used, like seat belt fastners from '05 and steering rod ends and t-tray support bars from '04. However, the vast majority of parts used on this car are unique to the 2007 B-spec chassis.
The car was used testing in Barcelona November and Jerez December 2007, and I know Andreas Zuber and Luca Filippi did some of the driving. I dont know which other drivers were involved with testing, but very likely the ones you mention.